not too hard I guess, 4 different couples of coords for each number and a background for the rest of the screen... and obviously the 10 digits. Pushing a bit the concept could be possible to add the extra thrasparent layer for the 5 'moods' (at some point I thinkied to create a desaturated led version with color moodable). With a bit of creativity (and real talent) should be possible to use the extra layers with something less dumb than simple colors (add stickers, objects or whatever anyone could be crazy enough to think.

mh, that jpg compression really look like s*it, it look nicer wint png on the tablet